# 1. Goal
Define the interface {{P}}IF_COBBLER in package $TMP. A cobbler's workshop
repairs shoes. The order desk takes the repair orders and the pricing engine
prices them. The interface is the contract between the order desk and the
pricing engine. The interface carries the service codes, the reason codes,
the price parameters and the two methods CHECK and PRICE.

# 2. Open questions
None.

# 3. Context
- The interface {{P}}IF_COBBLER does not exist yet. Create it in package $TMP.
- One repair order covers one service and one number of pairs of shoes.
- The method CHECK tells the order desk whether an order can be priced. It
  returns C_REASON-SERVICE if the service of the order is not one of the four
  codes of C_SERVICE. It returns C_REASON-PAIRS if the number of pairs is less
  than 1 or greater than C_RULE-MAX_PAIRS. Else it returns C_REASON-OK.
- The method PRICE calculates the price of an order in euro. It multiplies the
  base price of the service with the number of pairs, adds
  C_RULE-EXPRESS_PERCENT percent if EXPRESS is true, subtracts
  C_RULE-MEMBER_PERCENT percent if MEMBER is true, rounds the result to full
  10 cents (5 cents round up) and never returns less than C_RULE-MIN_ORDER.
- The workshop keeps the service codes and the price parameters in the
  interface, so that the order desk and the pricing engine use the same values.
- The pricing engine that implements the interface is not part of this task.
- No database table, no CDS view, no function module and no report is needed.

# 4. Contract
- Create the interface {{P}}IF_COBBLER in package $TMP.
- The interface is public.
- The interface has the types, the constants and the methods of section 5 and
  nothing else.

# 5. Business rules
1. The interface has exactly two methods: CHECK and PRICE.
2. TY_REASON is a text field of length 10.
3. TY_SERVICE is a text field of length 4.
4. TY_AMOUNT is a packed number of length 8 with 2 decimal places.
5. TY_ORDER is a structure with exactly four components in this order: SERVICE
   of type TY_SERVICE, PAIRS of type i, EXPRESS of type abap_bool and MEMBER
   of type abap_bool.
6. C_SERVICE holds the four service codes of the workshop. The components, the
   types and the values are: HEEL of type TY_SERVICE = 'HEEL' (heel
   replacement), SOLE of type TY_SERVICE = 'SOLE' (full sole), SEAM of type
   TY_SERVICE = 'SEAM' (seam repair) and POLISH of type TY_SERVICE = 'POLI'
   (clean and polish).
7. C_REASON holds the three reason codes of the check. The components, the
   types and the values are: OK of type TY_REASON = 'OK', SERVICE of type
   TY_REASON = 'SERVICE' and PAIRS of type TY_REASON = 'PAIRS'.
8. C_RULE holds the price parameters. The components, the types and the values
   are: MAX_PAIRS of type i = 12, EXPRESS_PERCENT of type i = 40,
   MEMBER_PERCENT of type i = 10 and MIN_ORDER of type TY_AMOUNT = 8.00.
9. C_BASE_PRICE holds the price of one pair of shoes for each service. The
   components, the types and the values are: HEEL of type TY_AMOUNT = 12.50,
   SOLE of type TY_AMOUNT = 25.00, SEAM of type TY_AMOUNT = 8.00 and POLISH of
   type TY_AMOUNT = 6.50.
10. The method CHECK has the importing parameter IS_ORDER of type TY_ORDER and
    the returning parameter RV_REASON of type TY_REASON.
11. The method PRICE has the importing parameter IS_ORDER of type TY_ORDER and
    the returning parameter RV_PRICE of type TY_AMOUNT.

# 6. Constraints
- Release target: SAP_BASIS 816 (ABAP Platform 2025).
- Coding standards: Clean ABAP. Names as in section 5. No obsolete syntax.
- Out of scope: a class that implements the interface, a database table, a CDS
  view, a function module and a report.

# 7. Acceptance
- The interface is active and has no syntax error.
- The interface has exactly the types, the constants and the methods of
  section 5.
- Write your own ABAP Unit tests in the global test class {{P}}COBBLER_TEST in
  package $TMP. The class is public, final and it is a test class
  (FOR TESTING DURATION SHORT RISK LEVEL HARMLESS). Test the constants, the
  type lengths and the method signatures of {{P}}IF_COBBLER.
- The hidden tests pass.